You'll note I didn't mention Christians at all in my post, just people. I'm not going to extend this opinion of mine further than the subject matter at hand: a woman feeding a baby.
If a person cannot handle seeing a baby eat from the most natural of all food sources, then the problem lies not with the one feeding the baby, but the one lusting after the mother for it.
There are more delicate ways to handle breastfeeding in public and were I in the position of breastfeeding, I would be covered, because I wouldn't want to be lusted after for feeding my baby.